Serum and urine free light chains measurements in patients with systemic sclerosis: novel biomarkers for disease activity

Mariapaola Marino, Cecilia Napodano, Umberto Basile, Antonietta Gigante, Chiara Pellicano, Giorgia Leodori, Lorenzo Vantaggio, Francesca Gulli, Marcella Visentini, Edoardo Rosato

Risultato della ricerca: Contributo in rivistaArticolo in rivista

Abstract

Circulating free light chains (FLCs), considered biomarkers of B cell activity, are frequently elevated in patients affected by systemic inflammatory autoimmune diseases. As the systemic sclerosis (SSc) clinical course can be variable, this study is aimed at evaluating FLCs levels in affected individuals as biomarkers of disease activity. We assessed FLC levels in serum and urine of 72 SSc patients and 30 healthy controls (HC). Results were analyzed in comparison with overall clinical and laboratory findings, disease activity index (DAI) and disease severity scale (DSS). SSc patients displayed increased levels of κ and λ FLC in serum significantly higher than HC (p = 0.0001) alongside the mean values of free κ/λ ratio and κ + λ sum (p = 0.0001). SSc patients showed increased free κ in urine with a κ/λ higher than HC (p = 0.0001). SSc patients with increased κ + λ in serum showed that erythro-sedimentation rate (p = 0.034), C-reactive protein (p = 0.003), DAI (p = 0.024) and DSS (p = 0.015) were higher if compared to SSc patients with normal levels of FLC. A positive linear correlation was found between serum levels of free κ and DAI (r = 0.29, p = 0.014). In addition, SSc patients with increased free κ in urine had higher DAI (p = 0.048) than SSc patients with normal κ levels. Our results strengthen the role of serum FLC as useful biomarker in clinical practice to early diagnosis and monitor disease activity, showing for the first time that also urine FLC levels correlated with disease activity in SSc patients.
Lingua originaleEnglish
pagine (da-a)1-7
Numero di pagine7
RivistaClinical and Experimental Immunology
Volume2021
DOI
Stato di pubblicazionePubblicato - 2021

Keywords

  • autoimmunity
  • urine free light chains
  • systemic sclerosis
  • serum free light chains

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